Question

public class PlaneDemo
{
    public static void main(String args[])
    {
        ArrayQueue<Plane> q = new ArrayQueue<Plane>();
        Plane p1 = new Plane("Aircraft 1", 3);
        Plane p2 = new Plane("Aircraft 2", 1);
        Plane p3 = new Plane("Aircraft 3", 2);

        q.addQueue(p1);
        q.addQueue(p2);
        q.addQueue(p3);

        while(!q.isEmptyQueue())
        {
            System.out.println("Vehicle: ");
            System.out.println(q.front());
            q.deleteQueue();
        }
    }
}

cannot find symbol
      q.addQueue(p1);
       ^
  symbol:   method addQueue(Plane)
  location: variable q of type ArrayQueue<Plane>

error: cannot find symbol
      q.addQueue(p2);
       ^
  symbol:   method addQueue(Plane)
  location: variable q of type ArrayQueue<Plane>

我喜欢恐慌，这很快就要到了，我无法弄清楚我做错了什么。

    public class ArrayQueue<T>
{
    private int maxQueueSize;
    private int count;
    private int queueFront;
    private int queueRear;
    private T[] list;

    public ArrayQueue()
    {
        maxQueueSize = 100;
        queueFront = 0;
        queueRear = maxQueueSize - 1;
        count = 0;
        list = (T[]) new Object[maxQueueSize];
    }

    public ArrayQueue(int queueSize)
    {
        if(queueSize <= 0)
        {
            System.err.println("Array size must be a positive number. Creating array at default size of 100.");
            maxQueueSize = 100;
        }
        else
            maxQueueSize = queueSize;

        queueFront = 0;
        queueRear = maxQueueSize - 1;
        count = 0;
        list = (T[]) new Object[maxQueueSize];
    }

    public void initializeQueue()
    {
        for(int i = queueFront; i < queueRear; i = (i + 1) % maxQueueSize)
        list[i] = null;

        queueFront = 0;
        queueRear = maxQueueSize - 1;
        count = 0;
    }

    public boolean isEmptyQueue()
    {
        return(count == 0);
    }

    public boolean isFullQueue()
    {
        return(count == maxQueueSize);
    }

    public T peek() //throws QueueUnderflowException
    {
        /*if(isEmptyQueue())
            throw new QueueUnderflowException();*/

        return (T) list[queueFront];
    }

    /*public T back() throws QueueOverflowException
    {
        if(isFullQueue())
            throw new QueueUnderflowException();
        return (T) list[queueRear];
    }
*/
    public void enqueue(T queueElement) throws QueueOverflowException
    {
        if(isFullQueue())
            throw new QueueOverflowException();

        queueRear = (queueRear + 1) % maxQueueSize;
        count++;
        list[queueRear] = queueElement;
    }

    public void dequeue() throws QueueUnderflowException
    {
        if(isEmptyQueue())
            throw new QueueUnderflowException();

        count--;
        list[queueFront] = null;

        queueFront = (queueFront + 1) % maxQueueSize;
    }
}

Answer 1

替换此

getpath($p[0:-1])

对于这个q.addQueue(p1); q.addQueue(p2); q.addQueue(p3);因为是唯一的方法，你必须向类中添加一个元素

q.enqueue(p1); etc

Java程序无法找到符号

1 个答案: